The Orphan Tsunami
March 15, 2011 2:01 PM Subscribe
posted by Danf (18 comments total)
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Around midnight on January 27, 1700, a mysterious tsunami
stole through several villages on the eastern coast of Japan.
But in the days leading up to the 1700 tsunami, no earthquakes had been detected. Miho's leader wrote that such a thing was unheard of and wondered what to call the waves. "It is said that when an earthquake happens, something like large swells result, but there was no earthquake in either the village or nearby," he wrote. With no parent earthquake to claim it, the tsunami was labeled an "orphan."
Based on geologic evidence, scientists think that a massive magnitude-9.0 earthquake
rocked the Cascadia Subduction Zone region off Oregon and Washington sometime between 1680 and 1720. In 1997, analysis of tree-rings from the Cascadia region narrowed the time of the natural disaster to a 10-month window, from August 1699 to May 1700.
In Japan this event triggered the Orphan Tsunami.
(The last link is to a 144 pg. pdf document that will take forever to load, will tie up your computer while it does, but to the geology or history nerd, so worth it.)